Dough mixing and kneading machine



July 8, 1930. I F. AESCHBACH 1,770,292

DOUGH MIXING AND KNEADING MACHINE Filed Sept 12, 1929 2 Shuts-Sheet 1 lM/ENTOR:

5mm GM July 8, 1930.

Douc-H mxme AND xnmnms vacuum Filed Sept 12 1929- F. AESCHBACH 2 Shuts-Sheet 2 Mil ENTER: 5M W Patented July 8, 1 930 r cr merninnnron .AESCI-IBACI-I, or AAB-AU, SWITZERLAND DOUGH ivrixrne AND KNEADING MACHI E Application'filed September 12, 1929, SeiiaLNo. 392,216, and in Switzerland August 7, 1929,

I The present invention relates to a safety 1 device in dough mixing and kneading machines, having twoguides for working arms,

suchas a m-1xing-arm1and a kneading arm respectively, each of the arms being provided with fingers and movable along intercrossing paths and adapted to be lifted above, the f trough by means of a rack and pinion.

The object of the invention is to eliminate a possiblelcollision between the fingers of the two arms in their various positions, particularly, when the mixingarm is raised and when during the last working period for the dough the kneading arm aloneis'required to be op-' 15. erative. v

For this purpose, in the safety devicev ac cording to the invention,- the hub of the guide for the kneading arm is rotatably mounted on theone end of the hub of the guide for the r mixing arm, saldhubs being mounted on a common pivot-pin andarranged thereon to leave between two of their end'iaces, which are each provided with two notches, a free hub portion on whichare mounted tw'o lever arms engaging the mixing and kneading arm respectively and in the boss of each of which two pins are displaceably arranged which bear on an intermediate distance ring, whereby, the invariable length ofthe free hub portion is so defined that at all times the. pins of the one lever arinmust enter the notches in the adjacent shoulder portion or" the hub in order to permit a'swiveling motion of the other lever arm or a respective longitudinal displacement of the corresponding working arm, controlled thereby, I together. with its pertaining finger.

Owing to this arrangement the tWo work ing armsare adapted to be locked relatively to each other in such manner that the kneading arm isc'enabled to be lifted only when the mixing arm is in its topmost position, that during the lifting motion of the mixing arm the kneading arm remains iIl'itiS lowermost position, and that when both working arms take up their topmost positions the mixing arm only is preventedfrom being lowered.

In the drawing an embodiment of the invention'is shown byway of example, in which that the hub 14 surrounds the hub 15. on a Fig. 1 is a side elevation of a dough mixing and kneadingmachine; i

Fig. 2 is a frontview ofthe same, and

Figs. 3-8 show, on a larger scale in ele vation and in horizontal section respective- 5 ly, a partof-the gearing in threedifierent po-- sitions. s p 7 Fig.9 iSasect-ion on the line IXI-X' in Fig. 4,011 alarger scale. 7 1 In the machine illustrated, 1 designates the wheelable trough and 2the machine frame with its upper portionprojecting above the trough. On the front sideof the'machine frame two intermeshing spur gear wheels 3 are mounted beside each other to Which,- in 65.; a known manner, the guide 5 for the kneading arm and the guide 6 for the mixing arm' 'arelinl'red, by means of eccentric pinsfl, so

as to be disposed behind eacl'i other in two different planes. The said spur gear wheels are driven by the electro-motor 7 by means of a gearing housed in themachine frame. In the guides 5 andfi the kneading arm IQ and the mixing arm 11, of known constructioin: are displaceablyarranged and adapted tobe fixed in position by clamp screws-8, .9. The c 1 workingarms 10, 11 are design'ed as racks to.

mesh :each with a corresponding pinion; l2" mounted at the upper end of the pertaining guide so as to be rotatabl from outside by means of a hand. wheel 13. T he hub 14 0f the guide forjthe kneading arm 10 and the hub 15 of the guide for the mixing arm 11 are mounted on a common pivot pinj1 6, such wise,

portion of its length. On the free portion of the hub 15 two lever arms 17 and 18 are rotatably arranged and; each lever. arm is formed at'its one end'with a slot17 -or 18 respectivelyin which engages a guidepin 19, fixedtoeachworki-ng arm 10, 11 1 Between the bosses of the two lever arms 17, 18, a dis tancering' 20 isdisplaceably carried'by the hub 15 adjacent to both end facestof which diametrically opposed pins 21, 21 and 22,22 respectively are arranged, the one end portionof which iseased off, spherically and which are longitudinally displaceable in corresponding bores in the bosses of. the lever arms 17 and 18. The shoulder portions 14? and 15f of the hubs 14 and 15 are provided "1th corresponding spaced notches of spherical shape fitting with the ends of the pins 21, 22. Thereby, the distance between the and faces of the shoulder portions 1 1 and 15 of the hubs 14 and 15 1S so defined that the pins must enter the notches either on'the vented from being raised. On the other hand the mixing arm 11'is enabled to be lifted in that the pins 22, 22 clear their respective notches in the hub 15. i

In the position shown in Figs. 5 and 6, the mixing arm is raised in order to enable the kneading arm to work alone and, thereby, the lever arm 18 is turned so as to move the pertaining pins 22 opposite the corresponding notches to permit them to enter the same.

At this time, the kneading arm 10'is enabled to be raised also in that by doing so, the turning motion of the lever arm 17 eiiects the disengagement of the pins 21 from their corresponding notches and consequently a shifting-of the ring 20 and the pins 22 towards the mixing arm until'thelatter are firmly engaged in their respective notches so that the mixing arm' 11 is kept frommoving.

In the position shown in the Figs. 7 and 8 the kneading arm 10 is raised and the mixing arm 11 which is also in its topmost position is locked by the pins 22, 22 so as to be prevented from being lowered before the kneading arm is again moved into its lowermost position. 7

From the Figs. Sand 4: follows that the mixing arm 11, during the finishing treatment of the dough, is apt to be raised in any position, whilst the kneading arm remains locked in its lowest position of adjustment. Therefore, I collision between the working arms and their pertaining fingers is rendered entirely impossible in any position of the same. i 1

I claim:

1. In a dough mixing and kneading machine comprising, a trough, a mixing arm, a kneading arm, said working arms being movable along intercros'sing paths and'ada'pt ed to be raised above the said trough, a guide for each of the said working arms, a hub on each of the said guides, a common pivot for the said two hubs, a shoulder portion on each of the said hubs, two lever armsoperatively connected to the said workingarms, a boss-on each of the said lever'arms, said bosses being turnable about said commonpivot between the end faces of the said shoulder portions,

and means for selectively connecting the one lever arm to the pertaining guide so as to prevent the correspondingly working arm from moving relatively to the said guide and to permit a swivelling motion of the other lever arm or a respective movement of its corresponding working arm relatively to its guide, in order to'avoid collision between two, working arms.

2. In a dough mixing and kneading machine, comprising a trough, a mixing arm, a kneading arm, said working arms being movable along intercrossing paths and adapted to be raised above the saidtrough, a guide pin on each of the said working arms, a guide for each of the said working arms, means for longitudinally adjusting the same in the said guides, a hub on each of the said guides, at common pivot for the said two hubs, an extended end portion on the one hub to carry the other, a shoulder portionon each of the said hubs, two lever arms,alongitudinal'slot formed in each of the said lever arms for engaging the said guide pin on the pertaining working arm, a boss on each of the said lever arms, said bosses being turnable about said common pivot between the end faces of the said shoulder portions and means for selectively connecting the one lever arm to the pertaining guide so as to present the corresponding working arinfrom moving relatively I to the said guide and to permit a swivelling motion of the other lever arm or a respective movement of its corresponding working arm relatively to its guide, in order to avoid collision between the two working arms. 7

3. In a dough mixing and kneading machine comprising, a trough, a mixing arm, a kneading arm, said working arms being movable along intercrossing paths and adapted to be raised above the said trough, a guide pin oneaeh of the said working arms, a guide for each of the said working arms, means for longitudinally adjusting the same in the said guides, a hub on each of the said guides, a common pivot for the said two hubs, an ex.- tended end portion on the one hub to carry the other, a shoulder portion on each of the said hubs, two notches in the end face of each of the said shoulder portions, two lever arms, a longitudinal slot formed in each of the saidl'ever arms for engaging'the said guide pin on the pertaining working arm, a boss on each of the said lever arms, said bosses being turnableabout said common pivot between the end faces of the said shoulder portions, two axial bores in each of the said, bosses, a pair of pins for each boss, displaceably arranged in the bores thereof and adapted to engage the two notches in the end face of the adjacent shoulder portion with their one end, a distance ring arranged on the said extended hub port-ion, intermediate of the two bosses,ffor the said pins to bear on, whereby, the invariable distance be tween the two end faces of the said shoulder portions is so defined that at all times the pins of the one lever arm must enter the notches in the adjacent'shoulder portion of the hub in order to permit a swivelling motion of the other lever arm or a respective movement of the corresponding working arm relatively to its guide. 1

4. In a dough mixing and kneading machine comprising, a-trough, a mixing arm, a

kneading arm, said workingarms being movable along intercrossmgpaths and adapted to be raised above the said trough, a guide pin on each of the said working arms, a guide for each of the said working arms, means for longitudinally adjusting the same in the said guides, a hub on each of the said guides, a common pivot pin for the said two hubs, an

extended end portion on the one hub to carry the other, a shoulder portion on each of the said hubs, two notches in the end face of each of; the said shoulder portions, said notches being of hollow spherical shape, two

lever arms, a longitudinal slot formed in each of the said lever arms for engaging the said. guide pin on the pertaining working arm, a boss on each of the said lever arms, said bosses being turnable about said common a pivot pin between the end faces of the said shoulder portions, two axial bores in each of the said bosses, a'pair of pins for each boss, displaceably arranged in the bores thereof and adapted to engage the two notches in the end face of the adjacent shoulder portion with their one end,'said ends being eased off spherically, a distance ring arranged on'the said extended hub portion,'in-.

termediate of the two bosses, for the said pins. to bear on, whereby, the invariable distance between the two end faces of the said I shoulder portions is so defined that at all times the pins of the one lever arm must enter the notches in the adjacent shoulder portion of the hub in order to permit a swivelling motion of the other lever arm or a respec tive movement of the corresponding working arm relatively to its guide.

In testimony whereof I have signed name to this specification. I V

FRIEDRICH AESCHBAOH 

